Indicator supporting arm for precision tools



July 8, 1947. A. BEAUPRE INDICATOR SUPPORTING ARM FOR PRECISION TOOLS Filed Jan. 4, 1945 www Nm/ D km; 09

Patented July 8, 1947 UNITED STATES PATE-Nr oFFlcE INDICATOR SUPPORTING ARBI FOR PRECISION TOOLS Arthur Beaupre, Chicago, Ill. Application January 4, 1945, Serial No. 571,246

7 Claires- 1 This invention relates, in general, to precision tools for indicating or measuring the various angies of the outside or inside of an .object or :pattern, and other surfaces which are diicult to reach in making such measurements or indications, for the purposeof duplicating or reproducing such object. More particularly, the invention is vconcerned With an improved 4telescoping universally adjustable arm or bracket for sup.- porting the indicator, whereby the indicator may be placed in a, position to .contact or measure Athe angle or curvature of any surface, and maintained at such angular adjustment.

A further object is to provide an improved supporting armor bracket oi this character, Which will be of a simple, durable yand light construction, easily manipulated, effective and efcient in operation, and which, When vnot .in use, vmay be compactly arranged for storage r transporta.- tion purposes.

To the attainment of these ends and the ac.- complishment of other new and useful objects as will appear, the invention .consists in the features of novelty in substantially the construction, combination and arrangement `of the several parts, hereinafter more fully described and claimed, and shown in theaccompanyingdrawing illustrating this invention, in which Fig. 1 is a, View, partly in elevation, partly in section, and partly broken away, of an arm of this character, constructed in accordance with the principles of this invention.

Figs. 2 and 3 are detail perspective views .oi elements of the arm.

Fig. 4 is a, detail perspective view of one ,end of the body portion of one of the arm sections.

Fig. 5 is a View, partly in longitudinalsecticn, and partly in elevation, of another form of element of the arm.

Fig. 6 ,is a detail sectional View taken 'on line 6 6, Fig. 5.

Referring more' particularly to the drawing, the arm consists, essentially, of a section l0, which lis tubular and may be constructed of any suitable material, and may be of any desired ,size and configuration. .The ends o f the section lil are split, as at ll, and the split yportions preferably tapered, as at I2. Secured to eachend of the section lll, in any suitable manner, is a, collar L3 which is provided with peripheral :threads I4.

Conoperating with this Acollar is a chuck member |15 Which is lprovided With internal threads to .engage .and .cofoperate with the threads :t4 on the .collar ,'I 3. 'The chuckmemberis adaptedltobe sleeved `over the end ,of .the section J0, so as to engage the inclined ,portion I2 .of fthe section @lil and force Athe Aend ,of the section into Vgripjzng relation with a rball or circular member :L6 on the end .0f ,a member .If'l.

This element I6 is telescoped into the 'section Lil, and, being `circular, ,will be .clamped to I'the section ri-by the chuck l5, the glcbularend 1160i the fsetQn ,IFI permittngthese two sections to :be un'welsallyadiusted, one `withresnectto .theothen IA-f desired, fthe end :t5 vmay be :formed integrally with At'lieseCtioI-i yil, o r may be provided .with Va reduced `,portion 1 8 ,adapted to be .telescoped into agrecesjs I;9 vin the section ,I 1., `,and rsecured in ,any suitable manner. Both ends rvof vthe vsrllin flt are preferably of `a similar construction.

Eline .numeral '.20 ,designates ancther ,section Jof the yarm, yiifhih is preferably 4forrrled .in the same manner as the section l1, and .maybe ,tublllar. 'lf-.his .section A,25J Ais Vof a cross-.sectional sonrieuratien, to conform to .and .telescope within Ithe sectiQn :.lii, and Yis inmvided ywith .a globular lend, 12d, similari@ :the-,end :L6 of thesection all, Each cf th eenen/S111 and 2:0 is :adapted to telescope for afcensderable ,distan into .the :section |10, the section :29 as .Shownill :Fia 1 `beine thus telesqped., seas to Vvary ithe .overall lenetlrof the assembled ,sections :2.101, lil .and :Irl- .et .the ,same time, the globular end 2! of the sectionA beaecured :to 1 the section i0 .the same ,manner asthe @rrd 11.26 .of the section il, v,seas ,to permit Qf angular adjustment .ci One-,with respect t0 the other.

4if desired, tbeccllar l .and thechuck :l5 may be provide., respectively, with zflatrterledu. 22-23 for the reception o-f a tool lor implement to hold these carts while vthey brine :relatively ,edili ted. Another ySection :34, s imler in oerlstriltirl it@ the .'.Secten :2;0, may ne to the .Section 129 ina Simlarrmarmen ,endoif the .section 24 isarranged 1Aa, s l5, whereby an indicator suppe t' ,e ectlorl i215 may be Similarly Seemed@ and @Sinistre with respect to the section 24.

:In use., -thesecton lil is :clamped yor secured to a suitable :machina such as fa height gauge 3 machine, and it will be manifest that by adjusting the sections of the arm, one with respect to the other, the position of the indicator which is supported by the section may be varied. It will also be manifest that the length of the arm may be varied by adjusting any one or more of the sections longitudinally, one with respect to the other.

In Fig. 5, there is shown a modied form of one of the sections, by means of the use of which the length of the arm may be varied. This form may be used in addition to the form shown in Fig. l, or may be substituted for the section iB. The modified form of section embodies a tubular meniber 21 which is split at one end, as at 28, to form a resilient portion. Telescoped over, and secured to the tubular member, is a collar 29 which is provided with external screw threads Sil. This collar may be secured to the member 21 in any suitable manner, such as by means of screws Si. To the other end of the tubular member 21 is secured a collar 32, and the tubular member 21 is provided with slots 33-34 which are opposed to each other.

Supported by the collar 32 and also by the collar 29, is a sleeve 35 which is of an internal diameter considerably greater than the external diameter of the tubular member 21, and this sleeve 35 is provided with internal screw threads 38. Disposed Within the space 31, between the periphery of the member 21 and the sleeve 35, is a nut or collar 38 that is provided with external screw threads 39 that engage and co-operate with the threads 35.

Telescoping into the tubular member 21 from one end, is an arm section 40 which may be tubular or solid, and ts within the tubular member 21. This section 40 is secured to the nut or collar 38 in any suitable manner, preferably by means of a pin or fastening device 4l that passes transversely through the nut or collar 38, and also through the section 4U, the pin also passing through the slots 33-34, so that the element 40 will be moved longitudinally with respect to the tubular member 21 when the sleeve 35 is rotated, this sleeve being rotatably supported by means of the collars 29-32.

A globular extremity 42 is also provided on the section 40. The globular end i6 on the section I1 is adapted to be telescoped into the split end of the member 21, and clamped by means of a chuck member 43, similar to the chuck member l5. If desired, and in order to insure the gripping and holding of the globular end l@ of any of the sections, the gripping jaws of the section with which it is telescoped may be provided with a recess 44.

With this construction, it will be manifest that a universal adjustment may be obtained between the various sections of the supporting arm, and at the same time the length of the arm may be varied by telescoping the proximate ends of adjacent sections for the des-ired extent into one another.

While the preferred forms of the invention have been herein shown and described, it is to be understood that various changes may be made -in the details of construction and in the combination and arrangement of the several parts, within the scope of the claims, without departing from the spirit of this invention.

What is claimed as new is:

1. An indicator supporting arm for a precision instrument, embodying a plurality of sections one of which telescopes into another, means connect- 4 ing the telescoping portions of adjacent sections for relative angular adjustment, means whereby the arm may be supported by one end, and means at the other end of the arm for supporting an indicator.

2. An indicator supporting arm for a precision instrument, embodying a plurality of sections one of which telescopes int-o another, means connecting the telescoping portions of adjacent sections for relative angular adjustment, means whereby the arm may be supported by one end, means at the other end of the arm for supporting an indicator, and means whereby the length of one of said sections may be varied at will, the last said means embodying a screwthreaded connection between said elements.

3. An indicator supporting arm for a precision instrument, embodying a plurality of longitudinally spaced sections, an intermediate section, the adjacent ends of proximate sections arranged in telescoping relation, said telescoping portions adapted for relative angular adjustment, and means for clampingthe respective parts in any position to which they have been relatively adjusted.

4. An indicator supporting arm for a precision instrument, embodying sections arranged end to end and longitudinally spaced, the proximate ends of said sections being substantially ballshaped, an intermediate tubular section into the ends of which the proximate ends of the adjacent sections telescope, the said ends of the said tubular section being resilient, and clamping members adapted to be sleeved over said resilient ends, whereby to clamp the adjacent said sections in any relative angular position into which they have been moved.

5. An indicator supporting arm for a precision instrument, embodying sections arranged end to end and longitudinally spaced, the proximate ends of said sections being substantially ballshaped, an intermediate tubular section into the ends of which the proximate ends of the adjacent sections telescope, the said ends of the said tubular section being resilient, and clamping members adapted to be sleeved over said resilient ends, whereby to clamp the adjacent said sections in any relative angular position into which they have been moved, certain of said sections being also adapted for relative longitudinal adjustment and to be maintained in such relative adjusted position by the respective said clamping members.

6. An indicator arm for precision instruments, embodying a plurality of sections arranged end to end, the proximate ends of adjacent sections being connected for relative universal adjustment, one of said sections embodying telescoping elements, means adapting said elements for relative longitudinal and telescoping movements, means for maintaining said elements against relative rotation during such adjustment, means for connecting the proximate ends of adjacent arm sections for relative angular adjustment, a rotatable sleeve within which said telescoping portions are arranged, and means whereby, when said sleeve is rotated, longitudinal movement of the said telescoping portions of said elements will be eiected, to vary the length of said arm.

'1. An indicator arm for precision instruments, embodying a plurality of sections arranged end to end, the proximate ends of adjacent sections being connected for relative universal adjustment, one of said sections embodying telescoping elements, means adapting said elements for relative longitudinal and telescoping movements, means embodying a pin and slot connection between said telescoping elements for maintaining them against relative rotation during such adjustment, means for connecting the proximate ends of adjacent arm sections for relative angular adjustment, a rotatable sleeve within which said telescoping portions are arranged, and means whereby, when said sleeve is rotated, longitudinal movement of the said telescoping portions of said elements will be eiected, to vary the length of said arm.

ARTHUR BEAUPRE.

REFERENCES CITED The following references are of record in the le of this patent: 

